Other Matters - Narrative (Details)			1 Months Ended	3 Months Ended		4 Months Ended
	May 06, 2019 USD ($)	Mar. 20, 2019 USD ($) affiliate market station	Apr. 30, 2017 USD ($) phase station	Mar. 31, 2019 USD ($) market	Sep. 30, 2018 USD ($)	May 09, 2019 USD ($)	Mar. 23, 2018 USD ($)
Business Acquisition [Line Items]
Number of stations assigned new channels | station			13
Authorized reimbursement amount			$ 1,750,000,000.00
Authorized reimbursement amount, repacking fund							$ 1,000,000,000
Authorized reimbursement amount, repacking fund, full power, class a stations and multichannel distributors							$ 750,000,000
Repacking period			39 months
Number of repacking phases | phase			10
Capital expenditures incurred				$ 2,100,000
FCC reimbursements received				11,500,000
Amounts reimbursed as a percentage of total costs			92.50%
Severance charges				$ 4,100,000	$ 7,300,000
Number of markets In which entity operates | market				41
Nexstar Media Group, Television Stations
Business Acquisition [Line Items]
Number of television stations acquired | station		11
Number of markets In which entity operates | market		8
Number of Big Four affiliates | affiliate		8
Consideration transferred		$ 740,000,000
Number of markets in which an entity operates, additions | market		4
Subsequent Event
Business Acquisition [Line Items]
Capital expenditures incurred						$ 19,800,000
Subsequent Event | Justice Network And Quest
Business Acquisition [Line Items]
Consideration transferred	$ 77,000,000
Multicast Channels
Business Acquisition [Line Items]
Ownership percentage of multicast channels				15.00%